Reviewed: July 2026
Singapore roofs fail at laps, cracks and details under year-round UV and rain. A seamless cold-applied membrane removes the laps: Rayson SealForce RC40 aliphatic polyurea is UV-stable, walkable, carries certified cool-roof reflectance, and bonds over concrete, screed, metal, old membranes and bitumen — no hot works. Manufactured in Singapore with the full specification in an open technical data sheet.
| Cold-applied polyurea | Spray polyurea | Torch-on membrane | |
|---|---|---|---|
| Seams | Seamless | Seamless | Lapped sheets |
| Hot works needed | No | No (hot spray plant) | Yes — open flame |
| UV stability | Excellent (aliphatic) | Good | Good (mineral cap) |
| Best on | Re-roofing, complex details | Tanks, large fast programmes | New-build plain areas |
| Rayson system | SealForce RC40 | SealForce SP200 | — |
Exposed flat and pitched roofs: SealForce RC40 cold-applied aliphatic polyurea membrane (SealForce RC40 TDS (PDF)) — roller, brush or spray applied over concrete, screed, old membranes, metal, PU foam or bitumen, with certified cool-roof reflectance. Wet areas, gutters and deck transitions: SealForce RC30 elastic polyurea membrane (SealForce RC30 TDS (PDF)). Cracks, joints and upstand details are pre-treated with PatchBond TX80 non-sag epoxy repair compound, which bonds to vertical, overhead and damp concrete (PatchBond TX80 TDS (PDF)).
Survey first: identify debonded areas, waterlogged insulation and failed details. Then mechanical cleaning, cutting out unsound material, repairing with PatchBond TX80, and detailing drains, upstands and penetrations before the field membrane. The surface preparation guide covers the principles; roof details are agreed per project.
UV stability, walkability, substrate compatibility and reflectance for SealForce RC40 are published in its technical data sheet, in the open Rayson TDS library. We manufacture in Singapore — if a claim matters to your specification, ask us to substantiate it before you commit.
Related reading: coating vs membrane compared · all Rayson waterproofing systems · roofs & exposed structures application page.
Single-pack · 5.25 or 21 kg
Rayson SealForce RC40 is a two-component, cold-applied aliphatic polyurea waterproofing membrane for exposed roofs — roller-, brush- or spray-applied, UV-stable and walkable, with certified cool-roof reflectance.
Two-part · 25 kg + 1.5 kg
Rayson SealForce RC30 is a two-component, roller-applied polyurea-based liquid waterproofing membrane — highly elastic and hydrophobic, bonding strongly to concrete, tile, metal and asphalt for wet areas, roofs and car parks.
Fast-curing spray polyurea
Rayson SealForce SP200 is a hot spray-applied, 100% solids, rapid-curing pure polyurea membrane that forms a seamless, chemically resistant waterproof and protective lining on concrete and steel.
Two-part epoxy repair system
Rayson PatchBond TX80 is a two-component, solvent-free thixotropic epoxy adhesive and repair compound with exceptional sag resistance that bonds and fills on vertical, overhead and even mat-damp concrete surfaces.
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Open the libraryFor exposed roofs, a cold-applied aliphatic polyurea membrane — Rayson SealForce RC40 — because it is UV-stable, walkable and carries certified cool-roof reflectance for Singapore heat. It applies by roller, brush or spray over concrete, screed, old membranes, metal and even bitumen, avoiding hot works entirely.
Often yes. SealForce RC40 is formulated to bond over sound existing membranes, PU foam and bitumen, avoiding full strip-off cost and waste. Failed, debonded or waterlogged areas must still be cut out and repaired first — a survey decides how much.
Liquid-applied membranes are seamless — no laps, which is where torch-on sheets typically fail — and they need no open flame, which matters on occupied buildings. Torch-on remains common on new-build where large plain areas suit sheet goods. For re-roofing over complex details, seamless liquid systems have the practical edge.
A reflective roof coating bounces solar radiation instead of absorbing it, lowering roof surface temperature and the heat load transmitted into the building. SealForce RC40 carries certified cool-roof reflectance — one of the few roof-coating claims that is independently measurable.
Cracks, joints and upstand details are the failure points, so they are treated first: cut out, filled with PatchBond TX80 non-sag epoxy repair compound — which works on vertical, overhead and damp concrete — and detailed with reinforcement before the membrane goes on.
Tell us your surface, area and timeline — our Singapore technical team will recommend a practical system and price it fast.
Rayson assistant
Answers from Rayson's own product information
Guidance only — confirm specifications with the Rayson technical team.